6. The heavily polluted zone of the water reservoir is known as

A. pleosaprophytic zone
B. mesosaprophytic zone
C. oligosaprophytic zone
D. none of these

7. Streptomyces griseochromogenes is reported to show a potent curative effect against

A. rice blast disease
B. yellow blight of maize
C. milo of soybean
D. eyespot of sugarcane

8. Which of the following is selectively effective against dicot weeds?

A. Cycloheximide
B. Anisomycin
C. Herbicides A and B
D. Bialaphos

9. Which of the following/(s) can be used for the reduction of nitrate in wastewater?

A. Growth of Hypomicrobium in presence of added methanol
B. Micrococcus denitrificans cells encapsulated in liquid membranes
C. Both (a) and (b)
D. Nitrosomonas Europaea

10. Which of the following herbicide is known to be effective against perennial shrubs, annual weeds and weeds of rice?

A. Cycloheximide
B. Anisomycin
C. Herbicides
D. Bialaphos